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viii   Preface.

correspondents, yet I am sorry to be unable to make my acknowledgments except in comparatively few instances. The fact is that the passages in this book are seldom traceable to distinctly definite sources : commonly more than one person giving me information that partially covers the same subject, and not unfrequently my own subsequent enquiries modifying or-enlarging the hints I had received. Consequently I have given the names of authorities only when my information has been wholly due to them, or when their descriptions are so graphic that I have transferred them without alteration into my pages, or else when their statements require confirmation. It will be easy to see by the context to which of these categories each quotation belongs.